mod = 1000000007
eps = 10**-9


def main():
    import sys
    from heapq import heappop, heappush, heapify
    input = sys.stdin.readline

    N, K = map(int, input().split())
    A = list(map(int, input().split()))

    B = [-a for a in A]
    S = {a for a in A}
    heapify(B)

    flg = 1
    b_prev = 10**20
    cnt = 0
    while B:
        b = -heappop(B)
        if b == b_prev - 1:
            cnt += 1
        else:
            cnt = 0
        b_prev = b
        if cnt == 6:
            flg = 0
            break
        if b == 1:
            flg = 0
            break
        elif b <= 0:
            break
        if b - 1 in S:
            if b-4 not in S:
                S.add(b - 4)
                heappush(B, -(b-4))
        if b - 3 in S:
            if b-5 not in S:
                S.add(b - 5)
                heappush(B, -(b-5))
        if b - 5 in S:
            if b-6 not in S:
                S.add(b - 6)
                heappush(B, -(b-6))
    if flg:
        print("Yes")
    else:
        print("No")


if __name__ == '__main__':
    main()